Thermoactive piles ensure a dual function: they support mechanically the superstructure and at the same time they are used as heat exchanger elements. In comparison to standard design practice, this requires considering the associated thermal loadings from the operation of the heat exchange system. To assess the thermal effects on the mechanical behaviour, different design assumptions and modelling approaches can be used. Therefore, within the framework of European Cooperation in Science and Technology Action TU1405 ‘Geothermal Applications for Buildings and Infrastructures’, benchmarking of a single geothermal pile has been performed. Hence, both heating and cooling of the pile were considered while different rigidities (representing the upper structure) on the pile head were assumed. The results show that a broad range of design assumptions could be used, which unfortunately lead to noticeable differences. Although the main focus was on the methods and assumptions employed, the exercise also opens questions about the influence of transient effects, thermal strains in the ground, temperature cycles and so on. Owing to the complexity of the topic, some of them were just mentioned, while others were addressed in greater detail. In general, the findings emphasise the need for further practice-oriented guidance to be presented in design guidelines and standards.

中文翻译：

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基准练习的综合，用于热活性桩的岩土分析

热活性桩确保双重功能：它们机械地支撑上部结构，同时又用作热交换器元件。与标准设计实践相比，这需要考虑热交换系统运行中的相关热负荷。为了评估热对机械性能的影响，可以使用不同的设计假设和建模方法。因此，在欧洲科技合作行动TU1405“建筑物和基础设施的地热应用”的框架内，已对单个地热堆进行了基准测试。因此，考虑桩的加热和冷却，同时假定桩头的刚度不同（代表上部结构）。结果表明可以使用广泛的设计假设，不幸的是，这会导致明显的差异。尽管主要侧重于采用的方法和假设，但该练习还提出了有关瞬变效应，地面热应变，温度循环等影响的问题。由于该主题的复杂性，仅提及了其中一些，而另一些则进行了更详细的讨论。一般而言，调查结果强调需要在设计指南和标准中提供进一步的面向实践的指南。由于该主题的复杂性，仅提及了其中一些，而另一些则进行了更详细的讨论。一般而言，调查结果强调需要在设计指南和标准中提供进一步的面向实践的指南。由于该主题的复杂性，仅提及了其中一些，而另一些则进行了更详细的讨论。一般而言，调查结果强调需要在设计指南和标准中提供进一步的面向实践的指南。